mitt romney and first lady michelle obama holding campaign events in the commonwealth today. both sides paused to remember the lives lost in libya. romney tried to refocus his campaign on the economy and promised to stand up to china on trade issues. >>> there are reports that at least one person has been arrested in connection with the assault on the u.s. consulate in libya. that's according to libyan officials, but that has not been independently confirmed by nbc news yet. four americans were killed in na attack, including the american ambassador. meanwhile, the anti-american demonstrations continue across the middle east. protters are also taking aim at embassies in yemen and egypt. >>> what's happening in the middle east is a reminder of the risks that come with diplomatic service. but many foreign service workers here in washington see the work as a calling. as derrick ward reports, situations like this only strengthen their resolve. >> reporter: at the state department, flags are at half staff. and from across the globe, the pictures are disturbing. it's brought new att